Posted 12/19/2014 9:36 AM (GMT -6)
I don't take Erfa but I do know that changing the formula of a thyroid medication can affect the absorption, and
even the effectiveness of the medication.
I experienced that when the GSK reformulated and sold Eltroxin to Aspen pharma.
What you need to do is to test your levels at least six weeks since you started the new formula and to adjust your dose as necessary , and if still not feeling well you might want to try another brand !